audit: type=1400 audit(1566347027.492:23): avc: denied { create } for pid=4529 comm="syz-executor.3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_rdma_socket permissive=1 INFO: task syz-executor.2:2104 blocked for more than 140 seconds. Not tainted 4.9.189+ #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D25528 2104 1 0x00000004 0000000000000087 ffff8801cea65f00 ffff8801cf1db180 ffff8801db721000 ffff88019e250000 ffff8801db721018 ffff8801a4f476a8 ffffffff82818d1e 0000000000000246 ffffffff831f3668 00ff8801cea667a8 ffff8801db7218f0 Call Trace: [<00000000fbcf7d28>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<000000008ed978c7>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<00000000eec9a070>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<00000000eec9a070>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<000000007ec7872a>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 [<00000000f46d9bfd>] blkdev_get+0x2e8/0x920 fs/block_dev.c:1424 [<0000000056ee820f>] blkdev_open+0x1aa/0x250 fs/block_dev.c:1579 [<0000000073f75c64>] do_dentry_open+0x422/0xd20 fs/open.c:791 [<00000000656fb661>] vfs_open+0x105/0x230 fs/open.c:904 [<000000007bf59aad>] do_last fs/namei.c:3457 [inline] [<000000007bf59aad>] path_openat+0xbf5/0x2f60 fs/namei.c:3581 [<000000008aa14628>] do_filp_open+0x1a1/0x280 fs/namei.c:3615 [<00000000bfec55da>] do_sys_open+0x2f0/0x610 fs/open.c:1097 [<00000000a763ad56>] SYSC_open fs/open.c:1115 [inline] [<00000000a763ad56>] SyS_open+0x2d/0x40 fs/open.c:1110 [<000000002818e5cc>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<000000004cea2ac2>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Showing all locks held in the system: 2 locks held by khungtaskd/24: #0: (rcu_read_lock){......}, at: [<000000000e619437>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<000000000e619437>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<000000004f3f2c25>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/1897: #0: (&f->f_pos_lock){+.+.+.}, at: [<000000004c752dcb>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2025: #0: (&tty->ldisc_sem){++++++}, at: [<000000004eb71a6c>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000d6c72e1b>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.2/2104: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000007ec7872a>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 1 lock held by syz-executor.4/2108: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000007ec7872a>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by syz-executor.5/4531: #0: (loop_index_mutex){+.+.+.}, at: [<0000000091873d7c>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 #1: (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<0000000075568427>] loop_control_ioctl+0x17f/0x320 drivers/block/loop.c:1987 1 lock held by syz-executor.5/4574: #0: (loop_index_mutex){+.+.+.}, at: [<0000000091873d7c>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 2 locks held by syz-executor.0/4539: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<00000000875a7637>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 #1: (&bdev->bd_mutex){+.+.+.}, at: [<000000004c4a7949>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 1 lock held by syz-executor.0/4552: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000007ec7872a>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by blkid/4542: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000007ec7872a>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<0000000043c99a94>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 2 locks held by blkid/4544: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000007ec7872a>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<0000000043c99a94>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 2 locks held by blkid/4546: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000007ec7872a>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<0000000043c99a94>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.189+ #3 ffff8801d98d7cc8 ffffffff81b65c01 0000000000000000 0000000000000000 0000000000000000 ffffffff81099a01 dffffc0000000000 ffff8801d98d7d00 ffffffff81b70e9c 0000000000000000 0000000000000000 0000000000000000 Call Trace: [<0000000095eca17e>] __dump_stack lib/dump_stack.c:15 [inline] [<0000000095eca17e>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<000000000ca533ec>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000a353eac2>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<0000000052a9f2b8>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<0000000005ae97bc>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<0000000005ae97bc>] check_hung_task kernel/hung_task.c:126 [inline] [<0000000005ae97bc>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<0000000005ae97bc>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<000000005525befb>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000013567f9>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff82827e71